He rahinga pūmau ka whakamahia hei ine i te nui o tētahi āhuatanga ōkiko, pērā i te roa me te paemahana. Ka whakatairitea te rahi o te mea e inea ana ki te rahi o te waeine. Ko te mita te waeine matua mō te roa. Arā ētahi waeine arokē (pērā i te kōnui). Ko ngā waeine arowhānui e tino whakamahia ana puta noa i te ao, ko ngā waeine ngahuru.
A fixed magnitude which is used to measure the size of a physical property such as length and temperature. The size of the thing being measured is compared with the size of the unit. The metre is the main unit for measuring length. Some units can be non-standard, such as thumb width. The standard units of measurement used throughout the world are metric units.